Berlin 2008 – scientific programme
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DS: Fachverband Dünne Schichten
DS 19: Organic Interfaces (SYSA 6)
DS 19.6: Talk
Wednesday, February 27, 2008, 16:00–16:15, H 2013
Influence of Intermolecular Bonding on Interface Barrier Formation of ZnPcCl8 on Ag111 Observed by Kelvin Probe Force Microscopy — •Peter Milde1, Christian Loppacher2, Ulrich Zerweck1, Mireille Mossoyan2, and Lukas M. Eng1 — 1Institut für Angewandte Photophysik, Technische Universität Dresden — 2Laboratoire de Matériaux et Microélectronique de Provence, Universités Paul Cézanne, Marseille
Phthalocyanines are a common class of organic dyes for applications in optoelectronic devices. Compared to the standard phthalocyanine, halogenated phthalocyanine shows a different and more complex bonding behavior. Within the first monolayer of ZnPcCl8 on Ag111 distinct structural phases where observed, which can be attributed to the formation of 8, 4 and no intermolecular hydrogen-halogenide bonds[1].
FM-KPFM measurements reveal, that the bonding behavior does not only affect the structural ordering but also the electronic properties of the molecule and thus the interface barrier formation. Furthermore, a reversed sign of the contact potential change is found between ordered and disordered molecular layers.
Our results suggest, that for applications, in which single molecules or monolayers are used, it is crucial to exactly know the molecular arrangement at the interface, because both, the orientation and the intermolecular bonding, can strongly influence the interface barrier height.
[1] M. Abel et al., ChemPhysChem 7:82 (2006)